Best practice for database migration in 11g

Hello,
Database migration is required due to OS change.  Here, I have two database instances say A and B in the old server where RDBMS_VERSION is 11.1.0.7.0. They need to be migrated into a new OS where the oracle has been installed with version 11.2.0.2.0.
Since all data + objects need to be migrated into the new server, I want to know what the best practice is and how to do that. Thanks in advance for your necessary guidance.
Thanks and Regards,
Prosenjit

Hi Prosenjit,
you have some options.
1. RMAN Restore: you can restore your database via rman to the new host, and then upgrade it.
    Please follow instruction from MOS Note: RMAN Restore of Backups as Part of a Database Upgrade (Doc ID 790559.1)
2. Data Guard: check the MOS Note: Mixed Oracle Version support with Data Guard Redo Transport Services (Doc ID 785347.1)
3. Full Export / Import (DataPump)
Borys

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